2 x boron carbide nozzle: 1 x silver & 1 x black As the mixture exits the end of the hose, the jet nozzle accelerates the air and abrasive. The length of the cone, the inlet and the outlet of the nozzle determine the pattern and the speed of the blasting medium emerging from the nozzle. It is durable and can give you a long service life. The composition of the coating material determines its wear resistance. Perfect for manual box grinder and box type automatic sanding machine, which is suitable for removing tar, rust, old paint and many other materials. Business: 1.The operator inserts the nozzle washer into a foreign-threaded nozzle holder and turns it into the nozzle by turning it by hand until it is firmly seated on the washer. 2. When all associated equipment is properly assembled and tested, the operator directs the nozzle at the surface to be cleaned and presses the remote control handle to start blasting. 3. The operator holds the nozzle 18 to 36 inch from the surface and moves it evenly at a speed that produces the desired purity.Each pass should overlap slightly. 4.The operator must replace the nozzle as soon as the opening is 1/16 inch beyond the original size. Size: 89 x 47mm/35mmx20mmx3mm Material: boron carbide/aluminum alloy + boron carbide Color: Black/ Silver Package Contents: 2 x boron carbide nozzle 1 x air jet Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.